Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c7fdf393d4250fe69ac70470d1f8a81d549975023c7967331e94fbf4b893a18' 
  AND token = 'g1ssKSvuIc1hdwxdraVzp5zMqMh70diY/inAa/+dhiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}